Fan



FIG. 1 is a bottom perspective view of the fan;

FIG. 2 is a front view of the fan;

FIG. 3 is a right side view of the fan;

FIG. 4 is a rear view of the fan;

FIG. 5 is a left side view of the fan; and,

FIG. 6 is a bottom view of the fan.

The broken lines showing portions of the fan form no part of the claimed design. 

CLAIM The ornamental design for a fan, as shown and described. 